What are the general rules for residential wiring work
General Rules for residential wiring All electrics supply lines and apparatus shall be of sufficient in mechanical strength and size […]
Basic Electrical
Transformer
Transformer Oil Testing
Regular sampling and testing of insulation oil taken from the transformer is a valuable technique in the preventative maintenance program.
Renewable Energy
Solar PV plant Monitor and performance issues
Solar PV monitor Monitoring is very common with Solar PV systems. Often residential monitoring consists of a device that measures
Basic Electrical
Define Volts and Power and Calculation formula
Volts Current x Resistance = Volts I x R = V Voltage is equal to current multiplied by resistance. This
Basic Electrical
Define Short circuit and when does electric short circuit occurs
Define short circuit A short circuit is an abnormal connection of very low impedance between two points of different potential,
Trending
Solid State Transformer (SST)
What is Solid State Transformer? Solid state transformer has been put as one of the emerging technologies in power electronics.
Transmission Line
How to locate Cable fault
Cable fault locate technique Without cable fault indicators the utility must rely on more manual techniques for finding the location
Electrical Appliance
Nickel Cadmium (NiCd) Battery: Application, Advantages and Disadvantages
What is Nickel–Cadmium (NiCd) Battery? The nickel cadmium battery (Ni–Cd battery) (commonly abbreviated NiCd or NiCad) is a type of
Electrical Appliance
What is Nickel iron battery
What is Nickel iron battery ? The nickel–iron battery (NiFe battery) is a storage battery having a nickel(III) oxide-hydroxide cathode
Basic Electrical
What is Electrolysis and Industrial application
Define Electrolysis Electrolysis is the passage of a direct electric current through an ionic substance that is either molten or
Electrical Appliance
What is Drop Out (swing out) Fuse
Working of Drop out Fuse When an overcurrent or short-circuit situation occurs, the fuse element within the device melts, disconnecting
Electrical Substation
Fire -fighting equipment used in Electrical Substation
Fire Buckets A Fire Bucket is filled with sand or water and is used to extinguish fires. Sand is often
MCQ (Objective)
Objective (MCQ) on Wiring tools, safety components and cables
1. ELCB gives protection against (A) Shock (B) Overload (C) Short Circuits (D) All of the above Answer: – Option
MCQ (Objective)
Objective (MCQ) on Thermal Power Plant
The boiler commonly used in a thermal plant are__________________. a) Water tube type b) Fire tube c) Both (a) &
MCQ (Objective)
Objective (MCQ) on Synchronous Motor
Synchronous motors are generally not self-starting because (a) the direction of rotation is not fixed (b) the direction of instantaneous
MCQ (Objective)
Objective (MCQ) on Induction Motor
Which of the following component is usually fabricated out of silicon steel ? (a) Bearings (b) Shaft (c) Stator core
MCQ (Objective)
Objective (MCQ) on Earthing System
The ground wire is coloured Green Black Yellow Red Answer: – Option 1 The maximum permissible value of earth resistance
MCQ (Objective)
Objective (MCQ) on Battery and Cell
“The mass of an ion liberated at an electrode is directly proportional to the quantity of electricity”. The above statement
MCQ (Objective)
Objective (MCQ) question on single phase Induction Motor
In a split phase motor, the running winding should have (a) high resistance and low inductance (b) low resistance and
MCQ (Objective)
Objective (MCQ) question on DC Motors
No-load speed of which of the following motor will be highest ? (a) Shunt motor (b) Series motor (c) Cumulative
Electrical Substation
Accessories used in Electrical Substation
Accessories used in Electrical Substation Power transformers: These are essential for stepping down the secondary transmission level voltage to primary
Transformer
Hot spot formation in Transformer
Causes of Hot spot formation in Transformer The winding is heated up by I2R losses, the core is heated up
Electrical Appliance
What is UPS, Types of UPS and selection of UPS and Battery bank
What is UPS and Full name of UPS? UPS-Uninterruptible Power Supply An uninterruptible power supply or uninterruptible power source (UPS)
Electrical Machine
Commutation in D.C. Motors
What is Commutation in DC Motor? Commutation is the process of reversal of current in the short circuited armature coil.
Electrical Machine
D.C. Motor: Working, Types, Application and their fault
What is D.C. motor? A machine that converts d.c. power into mechanical power is known as a D.C. motor. Its
Electrical Machine
Armature Reaction in D.C. Motors
Armature Reaction in D.C. Motors Armature reaction is expected because when current flows through the armature conductors of a d.c.
Interview
Interview question on DC Machine
Interview question on DC Machine Q: What are the essential parts of DC machine? Magnetic frame or yoke Poles Armature
Electrical Machine
Under Excitation Protection in Generators
Introduction Under Excitation Protection in Generators is a critical safeguard mechanism designed to prevent damage to synchronous generators (alternators) when
Electrical Machine
Motors used in domestic and industrial service
Domestic uses: Small universal motors of the series type are used in domestic appliances like vacuum cleaners, refrigerators, washing machine,
Electrical Machine
Rheostatic Braking of D. C. Series Motor
Rheostatic Braking of D. C. Series Motor Under normal running condition, the armature winding and series field winding are connected